Eight sexually developed females were kept in a container filled with 800 mL tap water for 48 hours. The water was then filtered using Whatman filter paper and the filtrate was lyophilised. The lyophilised sample was dissolved in 50 mM Tris-HCl (8.5 mL) containing 150 mM NaCl (pH 7.5) and filtered again using 0.45-μm-pore filters (DISMIC-25CS, Advantec). One quarter of the total amount of water was saved while the remainder was used for affinity chromatography.
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